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Date:	Mon, 05 Jan 2015 15:10:36 -0800
From:	Dave Hansen <>
To:	Andy Lutomirski <>
CC:	Andi Kleen <>,
	"" <>,
	X86 ML <>, Thomas Gleixner <>
Subject: Re: [PATCH 3.19 3/3] x86, mpx: Change the MPX enable/disable API
 to arch_prctl

On 01/05/2015 03:04 PM, Andy Lutomirski wrote:
>> > Yeah, I'd _really_ prefer not to change it.  The code is in a gcc
>> > branch, but is getting pulled in to the 5.0 release.  We've got
>> > *absolutely* no shortage of prctl numbers.
> We do, however, have a severe shortage of sanity in the prctl implementation.
> Anyway, if it's actually a problem to change it, I have no real
> problem keeping it, but I think we *really* need to validate the rest
> of the arguments at the very least.

Do you mean just adding a pair of

	if (arg2 || arg3 || arg4 || arg5)
		return -EINVAL;


That's perfectly fine with me.  I'm happy to queue up a patch to do just
that if that's what you're going for.
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